@misc{indiciae87d616165fae,
  title = {Analyses of outcrops and B-horizon soil samples, Iron River 1° x 2° quadrangle, Michigan-Wisconsin},
  author = {R.T. Hopkins and J. D. Hoffman and Henry V. Alminas},
  year = {1981},
  doi = {10.3133/ofr81779},
  url = {https://pubs.usgs.gov/publication/ofr81779},
  note = {Source identifier: ofr81779}
}